mineral
Polished green moss agate cabochon
Moss agate: microcrystalline quartz (SiO₂) with included chlorite/actinolite or iron-manganese minerals
AI-generated identification · may be incorrectHardness 6.5–7 Mohs; translucent to opaque green and white, with waxy to vitreous luster. It has cryptocrystalline quartz structure, no visible cleavage, and specific gravity around 2.6; the domed, polished form is a cabochon.
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Physical properties
Hardness 6.5–7 Mohs; translucent to opaque green and white, with waxy to vitreous luster. It has cryptocrystalline quartz structure, no visible cleavage, and specific gravity around 2.6; the domed, polished form is a cabochon.
Formation & geological history
Forms when silica-rich groundwater fills cavities and fractures in volcanic rocks, depositing chalcedony around branching mineral inclusions. Most specimens formed in Cenozoic volcanic environments, though exact age depends on locality.
Uses & applications
Used for cabochons, beads, carvings, and ornamental objects; attractive patterning can make it valuable to jewelry collectors.
Geological facts
The moss-like markings are mineral inclusions, not fossils or organic plant material. Green coloration commonly results from chlorite, actinolite, or iron-bearing inclusions.
Field identification & locations
Identify it by its green dendritic or cloudlike inclusions, smooth chalcedony body, glassy polish, and lack of cleavage; common sources include India, Brazil, Uruguay, the United States, and Australia.
